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Description
TCI D3472 1,3-Di-tert-butylimidazol-2-ylidene is a free N-heterocyclic carbene, a carbon-donor ligand widely used in organometallic catalysis and organocatalysis research. The compound is supplied as the isolated carbene rather than as an imidazolium precursor salt, which means researchers can use it directly without a separate deprotonation step involving a strong base. The two tert-butyl groups on the nitrogen atoms provide substantial steric protection around the carbene centre, making the carbene stable enough to be handled with air-free techniques while remaining highly reactive toward transition metals and a variety of electrophiles.
The property that makes this ligand a preferred choice is its strength as a sigma donor, which far exceeds that of conventional phosphines. The bond formed between the carbene and the metal centre is very strong, giving catalyst complexes that are more resistant to heat and longer-lived through the catalytic cycle. The steric bulk of the tert-butyl groups also shapes the environment around the metal, influencing both the oxidative addition and reductive elimination steps, and often improving activity on difficult or hindered substrates. As a free carbene, however, the compound is correspondingly demanding in its handling requirements.
In Indonesian laboratories, this ligand is typically found in university and institutional research groups working on homogeneous catalysis, ligand design, and methodology development for organic synthesis. Because it arrives as the pre-formed carbene, it fits well into workflows where a Schlenk line or glovebox is already in routine use and where researchers want to avoid the variability introduced by generating the carbene in situ from an imidazolium salt before each experiment.
Laboratory Applications
Preparation of transition metal NHC complexes — the isolated carbene coordinates directly to metal precursors, removing the in-situ deprotonation step and giving more reproducible complex formation.
Cross-coupling catalyst development — its strong sigma donation and steric bulk influence oxidative addition and reductive elimination, frequently improving turnover on hindered or otherwise difficult substrates.
Organocatalysis studies — as a free N-heterocyclic carbene it can act as a nucleophilic catalyst in its own right, without any metal centre or activating base present.
Thermally demanding catalytic reactions — the very strong carbene-metal bond makes the resulting complexes more heat resistant and longer-lived over extended catalytic cycles.
Ligand structure–activity comparison work — the well-defined tert-butyl substitution pattern makes it a useful benchmark ligand when evaluating steric and electronic effects against phosphines.
Chemical class: free N-heterocyclic carbene (isolated carbene, not an imidazolium precursor salt)
Pack sizes: available in standard TCI research-scale packaging; please confirm the required size when ordering
Storage: keep under inert atmosphere and handle using air-free techniques
Handling and Storage
As a free N-heterocyclic carbene, this material must be kept under an inert atmosphere and handled using air-free technique — a glovebox or Schlenk line is strongly recommended. Store the container tightly sealed in its original packaging, ideally within a secondary sealed container or desiccator, and keep it away from moisture, air, protic solvents, and electrophilic contaminants. Transfer only with dry, inert-gas-purged glassware and dry solvents. Work in a fume hood, wear appropriate gloves, safety glasses, and a laboratory coat, and consult the manufacturer's safety data sheet before first use.
